22792-13-8Relevant articles and documents
Palladium nanoparticles supported on ZIF-8 as an efficient heterogeneous catalyst for aminocarbonylation
Dang, Tuan T.,Zhu, Yinghuai,Ngiam, Joyce S. Y.,Ghosh, Subhash C.,Chen, Anqi,Seayad, Abdul M.
, p. 1406 - 1410 (2013/07/26)
Pd nanoparticles supported on ZIF-8 (PdNPs/ZIF-8) are described as an efficient heterogeneous catalyst for the aminocarbonylation of bromoarenes in the presence of phosphines and iodoarenes under phosphine-free conditions. The catalyst can be readily prepared and is air-stable. The palladium loading can be as low as 1 wt %, and the catalyst was recycled four times with negligible change in catalytic performance. A variety of pharmaceutically important amides was readily synthesized. A TON of 2540 was easily achieved in a batch reaction by scaling up to a gram scale. The catalyst reported can also be applied to the synthesis of cyclic and primary amides as well as an alkoxycarbonylation reaction to form an ester.
Radical mediated-direct conversion of aldehydes into acid bromides
Kang, Dong Ho,Joo, Tae Young,Chavasiri, Warinthorn,Jang, Doo Ok
, p. 285 - 287 (2007/10/03)
A method of preparing acid bromides directly from aldehydes with Br3CCO2Et under radical conditions was developed. Aromatic aldehydes with electron-donating group were found to be more reactive than aromatic aldehydes with electron-w
Antineoplastic agents. 379. Synthesis of phenstatin phosphate
Pettit, George R.,Toki, Brian,Herald, Delbert L.,Verdier-Pinard, Pascal,Boyd, Michael R.,Hamel, Ernest,Pettit, Robin K.
, p. 1688 - 1695 (2007/10/03)
A structure-activity relationship (SAR) study of the South African willow tree (Combretum caffrum) antineoplastic constituent combretastatin A- 4 (1b) directed at maintaining the (Z)stilbene relationship of the olefin diphenyl substituents led to synthesis of a potent cancer cell growth inhibitor designated phenstatin (3b). Initially phenstatin silyl ether (3a) was unexpectedly obtained by Jacobsen oxidation of combretastatin A-4 silyl ether (1c → 3a), and the parent phenstatin (3b) was later synthesized (6a → 3a → 3b) in quantity. Phenstatin was converted to the sodium phosphate prodrug (3d) by a dibenzyl phosphite phosphorylation and subsequent hydrogenolysis sequence (3b → 3c → 3d). Phenstatin (3b) inhibited growth of the pathogenic bacterium Neisseria gonorrhoeae and was a potent inhibitor of tubulin polymerization and the binding of colchicine to tubulin comparable to combretastatin A-4 (1b). Interestingly, the prodrugs were found to have reduced activity in these biochemical assays. While no significant tubulin activity was observed with the phosphorylated derivative of combretastatin A- 4 (1d), phosphate 3d retained detectable inhibitory effects in both assays.